libvips/TODO

- more stuff from util.c? too much to do it all now

- how about an indexed histogram?

  have two images, a 1-band index image and an n-band image to analyze

  for each pixel, add the n-band pixel to the bin indicated by the index image





- load 500 jpegs, shrink, save

  VM use is huge, ouch, could we use a bit less?

  maybe free all windows on evalend? are there regions left about? how come we
  use so many resources?

  get about 300 images in on the laptop

  

- VipsFormat next? where should we document the im_vip2jpeg() options?

  


- constant images:

	we make them with im_black(), then m_lintra(), then im_clip(). How
	about instead making a 1x1 pixel image and expanding it with im_emed()
	would this be quicker?

	test wth nip2

	might be rather similar, nip2 will use im_black() + im_maplut() I
	guess

	maybe optimise the expand-one-pixel mode of im_embed()?

- im_flood*() should use inline rather than #define

- we have tools/ and contrib/ argh

- Joe's new defs




Something like:

const char *im_system_image( IMAGE *in, const char *command, char **log );

Actions:

- create two empty temporary files
- write the image to the first
- call system() on the expanded command
- capture stdout/stderr into log
- delete the temp input file
- return the output filename, or NULL if the command failed (log is still
  returned in this case)

  The caller would open the output file, either with im_open(), or with it's
  own system (nip2 has it's own open file thing to give progress feedback and
  use disc for format conversion), and be responsible for deleting the temp
  output file at some point.



- 1-bit PNG read is broken?

  experimenting with                 

	png_set_shift( read->pPng, 2 );

  in im_png2vips.c

  test image in gmail

- rename vipsCC in SWIG as pyvips?







- try the new liboil thing:

	http://www.schleef.org/orc/

  pick something like abs and time it

- gbandjoin in Python seems to be broken

    a = VImage.VImage.gbandjoin ([a, a, a])

  fails with a typecheck error

  probably all IMAGEVEC wrappers are duff like this ... the proto should take
  a std::allocator too?

- all the messages like:

	(nip2:31883): GLib-GObject-WARNING **: IA__g_object_set_property:
	object class `VipsInterpolateBilinear' has no property named
	`sharpening'

  are v. annoying, can we suppress them? don't set unless the property exists
  in the vips generic property setter? or do it in nip2?

- vip2dj -rotate STILL does not always work, eg. try
  /data/john/study2/small0.v ... should NOT rotate, but it does

- IMAGE->file_length should be gint64 rather than size_t?

  if we make this change, need to remove extra casts from various uses

- rename "header" program? or maybe use "vips header" instead?

  it's disabled on ubuntu due to a name clash

- import ~/summer-demo/summer.tif fails with "unable to read embedded
  profile", is this a bug? better err msg would be good

  trying to catch errors now, but is it working? not sure

- look into G_GNUC_DEPRECATED for back compat in vips8

- use

	http://library.gnome.org/devel/glib/stable/glib-Byte-Order-Macros.html

  for swapping ... they are asm macros so we should see a speedup

WONTFIX for 7.18
================

- can we use conv_sep to speed up the memuse benchmarks?

- move im_shrink & friends to resample?

  match_linear, match_linear_search?

  what about im_stretch3.c, im_resize_linear

- im_render should use a hash for tile lookup ... or+shift x/y together

  load wtc.jpg, rotate 42 degrees, zoom in and out quickly for a while, quit

  tiles are leaked :(

  does not leak if you wait for repaint to finish before zooming/unzooming

  problem with waiting for paint to finish in render_kill?

- check mosaic1, global_balance, similarity etc. use of im__affine
  
  how can we move them to im_affinei ?

- make a "deprecated" package too

- update the Portfiles on the mac and on the website from the macports ones

- radiance read/write needs docs

  maybe have an im_format(3) page with all the built-in formats?

  hard until we document vips_object :(

- same for matio?

- doc strings would be nice, read the SWIG notes on this

- bilateral filtering, see:

	http://en.wikipedia.org/wiki/Bilateral_filter
	http://www.shellandslate.com/fastmedian.html

  also a mail from Martin Breidt has links to several fast free C
  implementations

- try making vips_add(), an operator as a class

- need to write interpolate docs ... manpages and tutorial

  difficult without docs for vips_object

- need a section for vipsobject in the tutorial

  also a manpage?

  not really stable yet :( don't document

- how to expose things like yafrsmooth's "sharpening" parameter to
  C++/Python?

  can we write a find-by-nickname function? eg.

  	GType vips_get_type (const char *base, const char *nickname)

  then 

  	vips_get_type ("VipsInterpolator", "bicubic")

  would get us the GType for VipsInterpolatorBicubic

- we shouldn't need to call im_invalidate() in gtkdisp4 :( how can we fix
  this?

  will im_invalidate() trash the render cache too?

- we should wrap the format API, also im_render*(), see gtkdisp.cc for sample
  code

- have a base VObject class and put the ref stuff in there ... share between
  VMask, VDisplay, VImage

- need an im_init_world() for C++ which does cmd-line args too, so C++ progs
  can get --vips-progress and stuff automatically

- more cleanups to the handling of vips format images, esp. we have vips write
  spread across many files atm

- could remove a lot of crappy old API

- try

	libsrc/convolution$ grep -l offsets *.c

  could we do the don't calc offsets thing unless bpl; changes thing in more
  places?

- unsharp should work on GREY16? should be easy to add GREY16->LABS

  no, labs is signed short, ranges are all differrent, and the scaling will be
  wrong anyway

  correct: import with ICC to labs, then process, then export to RGB, take
  green?

  yuk, can we add a 16bit path to vips's lab <--> rgb converter?

  use TIFF RGB16 as the 16bit RGB target

  im_XYZ2disp() would be easy to 16bit ... just need the 1,500 element table
  table->t_Yr2r[i] expanded
  
  im_disp2XYZ() uses im_col_rgb2XYZ() in a loop ... again, need
  the 1,500 element table table->t_r2Yr[i] expanded

  usually these three tables (t_r2Yr, t_g2Yg, t_b2Yb) will be identical, can
  we common them up? same for t_Yr2r etc.

  how big should the table be for 16 bits? 256 times larger? too big!

  we really just need a LUT for pow() with the right exponent, eg. 2.4 for
  sRGBs, and one for 1/2.4 ... see what calcul_tables does:

  	table->t_r2Yr[i] = yo + a * pow( i * table->ristep / f + c, ga );

  see



  

- test maxpos_avg, quite a few changes

- HAVE_HYPOT could define a hypot() macro?

- im_exr2vips can now use c++ api

  see TODO notes in openexr read (though they all need more openexr C API)

  consider openexr write

- python startup fails with plugins in vipslib:

	Fatal Python error: can't initialise module vips
	plugin: unable to open plugin "/home/john/vips/lib/resample.plg"
	plugin: /home/john/vips/lib/resample.plg: undefined symbol: im_start_one

  do we need to build plugins with -rpath etc. and more libs?

  or do we need to make sure our python modules export all their im_ symbols?

  check:

  	http://www.swig.org/Doc1.3/SWIGDocumentation.html#Python_nn8
	http://docs.python.org/dist/dist.html

- write our own python extension to call a vips operation by name

	result = vips_call ("name", args)

  then call that from VImage_method

- do we really need VImage_method? Can't we write

	__getattr__ (self, name) = lambda (obj_to_call, arguments):

  or something like that?

- TIFF load/save should use meta system for unknown tags

- balance should use new meta stuff

- magick2vips should spot ICC profiles and attach them as meta

- also png2vips?

- magick should set some header field for n_frames and frame_height? see also
  analyze

- im_csv2vips() could use "-" for filename to mean stdin

  but then we'd have to read to a malloced buffer of some sort rather than an
  image, since we might need to grow it during the read, since we couldn't
  then seek

- add erode/dilate 3x3 special case using a 512-bit LUT

  ... nope, actually slower :-( we end up doing an inner loop like

  	for( i = 0; i < 9; i++ )
		bits |= (p[o[i]] != 0) << i;

  which is horrible. Maybe if we had a one band true 1 bit image it'd be
  quicker since we could get bits out in parallel and wouldn't have to worry
  about converting non-zero to 1

  could have a Coding type for bitpack? eg. relational produces a bitpack
  image by default, boolean & morph can work on bitpack etc

  maybe something for vips8 ... we could have a flag on operations for the
  coding types they can accept, and if they are passed other type, they are
  automatically converted

- non-linear sharpen: replace each pixel by the lightest or darkest neighbour
  depending on which is closer in value

- can wrap other inplace funcs which use ink now we have vector_to_ink() in
  inplace_dispatch.c

  see also comments in nip2 TODO ... we could auto-wrap in vips_call.c

  cleaner!

- on win32, should not write matrix files in binary mode, we want CR/LF chars
  so we can load into excel etc easily

  how odd, we're doing

	if( !(fp = fopen( name, "w" )) ) {

  shouldn't be binary ... hmm